I wrote a C# function of DLL that returns a byte pointer that points to an array of pointers that point to structures. My C# code as below: unsafe public void myCSharpFunc(uint ipaddress, string starttime, string finishtime, ref byte data, ref int count) { byte* bytePointer = stackalloc byte[iCount];
// get data
for (int i = 0; i < iCount; i++)
{
sElementName = utf8Encoding.GetString(results[i].Column.Name);
bElementValue = results[i].Column.Value;
size = (bElementValue.Length);
elmtPointer = Marshal.AllocHGlobal(size);
try
{
// copy array to pointer
Marshal.Copy(bElementValue, 0, elmtPointer, size);
bytePointer[i] = (byte)elmtPointer;
}catch(Exception ex){
Console.WriteLine(("kvs_getTotal() Exception 1 message: " + ex.Message + "; string: " + ex.ToString() +
"; source: " + ex.Source));
}
}
data = bytePointer[0];
count = iCount;
}
data is a byte pointer that points to an array of pointers. Each pointer of the array points to a structure.
In C++ DLL, I have the following function: void myCPlusFunc(DWORD ipaddress, BYTE* starttime, BYTE* endtime, BYTE* data, int* count) { byte bData; long iCount = 0L;
//Initialize COM.
HRESULT hr = CoInitialize(NULL);
CString sStTime((char*)starttime);
CString sFnTime((char*)endtime);
IDrvMgr* pDrvMgr = NULL;
hr = CoCreateInstance(__uuidof(CKvsDrvMgr_Total),NULL,CLSCTX_INPROC_SERVER,__uuidof(IDrvMgr),(void**)&pDrvMgr);
pDrvMgr->myCSharpFunc(ipaddress, (LPCWSTR)sStTime, (LPCWSTR)sFnTime, &bData, &iCount);
*count = (int)iCount;
*data = bData;
// 結果の処理
wchar_t strBuf[30];
wsprintf(strBuf,(LPCWSTR)L"*record count ＝%d",*count);
MessageBox(NULL, (LPCWSTR)strBuf ,(LPCWSTR)L"◇kvs_getTotal() C++ 結果" , MB_OK);
// Uninitialize COM.
CoUninitialize();
return;
}
Then, in C test program like below:
define DATETIME_LEN 14
define TEST_SIZE 5
typedef struct{ DWORD ip; char datetime[DATETIME_LEN+1];
int num; } T_TOTAL;
int main(int argc, char* argv[]) { T_TOTAL tttest[TEST_SIZE] ={ {21539008, "20110712120101", 100}, {21539008, "20110712120102", 200}, {21539008, "20110712120103", 300}, {21539008, "20110712120104", 400}, {21539008, "20110712120105", 500} }; int iCount; BYTE bData;
// insert data
insDataFunc(tttest[0].ip, (BYTE*)tttest[0].datetime, (BYTE*)(&tttest[0]), sizeof(tttest[0]));
insDataFunc(tttest[1].ip, (BYTE*)tttest[1].datetime, (BYTE*)(&tttest[1]), sizeof(tttest[1]));
insDataFunc(tttest[2].ip, (BYTE*)tttest[2].datetime, (BYTE*)(&tttest[2]), sizeof(tttest[2]));
insDataFunc(tttest[3].ip, (BYTE*)tttest[3].datetime, (BYTE*)(&tttest[3]), sizeof(tttest[3]));
insDataFunc(tttest[4].ip, (BYTE*)tttest[4].datetime, (BYTE*)(&tttest[4]), sizeof(tttest[4]));
// search data
myCPlusFunc(tttest[0].ip, (BYTE*)tttest[0].datetime, (BYTE*)tttest[TEST_SIZE-1].datetime, &bData , &iCount);
return 0;
}
After calling the search function (myCPlusFunc() function), I want to check the data returned. Would you please tell me the way to manipulate the byte pointer (&bData) that points to array of pointers that point to structures. I haven't known the way to access the array of pointers that point to structures yet. Any help is highly appreciated!
JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)
